Build a Custom Servo Motor with a DC Motor

[@Dronebotworkshop]

Hi everyone - It's come to my attention that there has been someone masquerading as myself, responding to some comments here with a link to a Telegram chat to win a prize from me. THIS IS A SCAM, I am not holding a contest, nor do I have a Telegram account. PLEASE DO NOT RESPOND TO THESE MESSAGES!! It's happening on a lot of my videos, I'm taking steps to remove them manually, but as I have 162 videos, it will take some time. If you do run across a suspicious comment, I would appreciate you letting me know at [e-mail]. Thanks! Bill (The real one!)

[@Jeremy_Fielding]

I am so glad we finally got to start making something together after talking all this time. I look forward to continuing the series! And great video as usual.

[@TommyLum2]

Big fan of both of your channels! Awesome.

[@Leroys_Stuff]

I’m glad this happened. Great project both of you

[@PhG1961]

Excellent cooperation of 2 of my heroes ! Awesome video !

[@bigsteve6729]

Cool didn't know this will check it out

[@tombudd1281]

I've been watching your videos for a while. It's good to see you getting more exposure :)

[@jaimerosariojusticia]

Sir, I stumbled upon your channel looking for DIY projects, and I cannot be more than thankful for all the time and effort put in the content. No annoying (techno/pop) music, No only-hands-pointing-to-objects-without-any-description, No wobbling camera, No rant/obscene/offensive content, etc., You take the time to explain all the things related to each project, and the information is easy to understand and the projects are easy to work even without the deep knowledge. This is the 8th video so far I've watched in the last 2-3 days. This channel is what KZbin should be bringing up in their algorithm, not the other crap that shows twice or more on each search. I'm glad I found and subscribed.

[@tomthumb3085]

Totally agree that Jeremy Fielding is a genius. Not only that, but he’s a very humble guy who doesn’t assume you know how something works, and explains every step. He’s also a great father to his children, involving them at every stage so that they will have a thorough understanding of Electro-mechanical engineering. He’s the “go-to” guy when it comes to modelling.

[@m3chanist]

Agreed on all points. He is a wonderful man. You'd be lucky indeed to have his acquaintance.

[@arthurmorgan8966]

Title was awesome to begin with, didn’t know it was for Jeremy, another one of my favorite KZbinrs. This will make him happy and filled with joy like a child.

[@deankay4434]

I was controlling a dc motor to move a heater door on a vehicle that voltage varies from 12.8-14.3 volts dc. Using a standard actuator or pot for feed back. On the dash, it can be rotary or linear. This a custom built air distribution box in a 1967 pickup and just adjust heat from closed to wide open and anywhere in between. Enjoyed the channel & Jeremy. ASE Master Tech since 1978, retired.

[@ishimwehonore8042]

Thank you for guiding us to Jeremy for increasing our skills morely

[@josephpennella3396]

Love seeing two channels working together. Both great channels

[@sinjhguddu4974]

Am so glad that you and JF are buddies. I follow his channel. This project is thoroughly engrossing. Thank you!

[@1607rosie]

These are two of my favorite electronic channels . Jeremy is smart guy and also does a great job explaining things to you. Looks like you got got a fly by wire system.

[@edwardcdg]

Mine, too!

[@Nick-ye5kk]

Best channel in the business for this content.

[@pboston6RR]

Fantastic! Thank you!!! I drive a Tesla and have marveled at the steering and the lack of overshoot. I’m pretty sure the Teslas uses the PID logic (which I heard of here first) and your explanation of the three components of the PID system was very enlightening. It also gives me motivation to dig a little deeper in the PID thinking. Thanks for helping Jeremy and his fantastic workshop. I’m eagerly awaiting his second video to see how he fixed the broken steering shaft. Giving him a couple of nights to think of solutions will yield interesting results. 🤔

[@EsotericArctos]

This video came up in my feed with almost perfect timing as I am currently working on a couple of projects requiring custom servos that Ebay just cannot provide. Thank you for this.

[@jamescullins2709]

I have watched a lot of Jeremy videos. Very smart guy.

[@kbouwman64]

Bill, your explanation of PID was one of the best ones I have seen. I would like to argue though that there is a critical fourth parameter that always gets minimal, if any, attention. That fourth parameter is Calculation Interval. In any controlled operation there is latency; it takes time for a motor to spin up and move to a new position. A program loop running on a microcontroller will almost always execute many times faster than the actuator's operational latency. It will remeasuring a new actual position and calculating a new error and output before the motor has reached the position commanded by the previous calculation. This new calculation will be based on the incorrect assumption that the new measured position was the result of the previous calculation. This mistake will lead to runaway actuator behavior. It would seem from your demonstration that you are addressing this in your code somewhere, but I cannot find it. It would seem to me that it is critical when explaining how to employ a PID controller to address how the latency of the system being controlled. I love this series and this collaboration. I am trying to build a rover a little larger than Jeremy's so I will be following closely!!

[@prestonknodelliii838]

If the digital sample rate is high enough (with enough averaging) this will not happen. Mathematically there are 3 possible solutions : critically damped, underdamped, and overdamped. It will be stable if the PID is tuned overdamped near critically damped. It can oscillate if underdamped. There are mechanical issues also, : gear lash and natural resonance.

[@woodrowbrimm2805]

For those interested in more information on P.I.D. Controllers are also used with Type K Thermocouples and Relays to Control the Melt Temperature for Bullet Casters o greatly improve Temp. Consistency and improve uniformity by bullet caster to control the Melting Pot. There are several you Tube Videos about building them and Amazon has all the parts.

[@stevenpwilliams]

You do just incredible videos, as does Jeremy! Can't wait to digest this, and see further collaborations! Love both of your work!

[@nixo0077]

If I will find a second so interesting channel it make me go out of my everday work!! - no time at all.

[@alandavis6429]

You were right about Jeremy, he is a genius.

[@rhudithomas7582]

Another great video Bill. Thank you. I have been looking for closed loop DC motor control for years and just came across this video. This is what I need, except for the feedback. I have been a CNC tech for over 35 years, so "back in the day" all servo control was done with DC brushed motors, but now in these "modern" times it has moved into AC Servo motors. However, all industrial CNC machines use encoders to close the loop. Even China has been selling these cheap DC gear motors, with encoders, but there is not one person yet that has utilized this for any control. I want to control shades, windows, doors, DIY CNC, and anything to control linear motion with cheap DC closed loop. Would you please consider a video with H-bridge DC gear-motor, with encoder, to close the loop. It is needed more than most people think. lol

[@paulramasco6769]

This is awesome, Two of my favorite Makers on youtube.

[@BeefIngot]

I mentioned this on his video as well, but figured it might be use to someone here too: There is a really cheap alternative to traditional potentiometers called a magnetic absolute encoder. The typical one I have found that is cheap is called a AS5600 magnetic encoder. It can be had for about 2 bucks, and has a little breakout board where you either can get the same sort of signal you get from a potentiometer or receive data from I2C. It has sub degree accuracy, and won't fade and become less accurate over time like the wipes of a potentiometer. Actually I think I might be talking about what's talked about in the article as Hall Effect Sensors

[@jrkorman]

I was wondering the same. Thanks for bringing it up.

[@eternalxpectator]

This is one of the key components i''m using on my autonomous tractos project. Thanks for sharing!

[@jasonruch3529]

Man I love the way you explain everything like a great teacher would do!

[@piconano]

I was hoping you were going to make a servo with an optical encoder attached to the motor shaft of a NEMA stepper motor.

[@j1952d]

Good stuff, and great to see you having a collab. with Jeremy. One tiny niggle: I'd've been happier to see "Kp = 1.0;" rather than "Kp = 1;" to emphasise that it's not an integer. Just being a grumpy old git!

[@bradlesc1000]

I'm so excited to go through your stuff, I'm a 4th year mechanical engineering student and I'm about to take mechatronics so this should be fairly useful. Jeremy sent me btw this collab is cool!

[@OGMann]

Timely, as I just snagged a 24vdc 3a 2560 rpm motor from the maker shop. It's part of an armchair lift actuator. I was considering using it in a CNC hack, and using a circuit like this is exactly what I had in mind.

[@ardespmaker]

Thanks for this Bill - such good quality and simply put - worth waiting for!

[@JLCPCB]

Great episode! Also very good explanation of PID control! 🙂

[@uwe.herting.37431]

I especially love the code you wrote. Simple and very effective. Great work!

[@imarobodude]

this is very helpful thanks, aside from the confusion: it is called subscript, not "underscore" which would mean underlined

[@whatwhatdidtheysay...lyric2373]

OMG! Perfect timing! Im undertaking a project just like this. Great video, excellent job!!!! And a very practical real-world purpose

[@danieldivinsky4988]

Your videos are just fantastic!

[@glensharp3275]

Thanks for this great video! It gave me a good understanding of how to use the PID library.

[@Mtmonaghan]

May help some folk if they understand that a normal arduino has a 10 bite ADC. That is a possible 2^10 or 1024 divisions. The processor you are using is a 12 bite ADC, that is 2^12 or 4096 divisions. The pot you are using has a four rotation range but you are only using two of them. This is why your pot range is approximately 0 to 0.5 x 4096, about 2000.

[@bountyjha]

U r the most wonderful person on earth. U shoud make videos on PID. It would be really nice for students.

[@braddixon3338]

Another great episode! What I really find valuable in these, are the libraries and commands that are kind of hard to find out otherwise. As a question, I'm not sure why you called the D component of the PID a dampening element, as it is producing an output proportional to the rate of change of the input. The faster something is moving, the greater the output. I suppose you could use a negative Kd value to subtract a rapid motion, so slow things down.

[@Enigma758]

D helps prevent oscillations via "prediction". It actually is related to damping.

[@murraymadness4674]

I would think to use a stepper motor with a position encoder (can be a pot). I'd also note that I took apart a small r/c servo and used it to power a bigger dc motor.

[@primecouncil6475]

i hope i will be able to adapt this knowledge to make robotic joint out of hydraulic valves and my cheapass muscles anywho, thanks for the video and huge effort of making it!

[@wardogdauwdd3020]

This is vary helpful I been looking for a video like this to help with my robotics project I'm building a custom show time animatronic

[@mrkattm]

Why are you setting the position with PWM? That makes sense if you are transmitting position via an RF link but if you are hard wired an error voltage makes for a simpler implementation.

[@narayan6911]

Thats the video i am looking for so long. Thnks for detailed explanations ❤️👍

[@tolikche]

Thanks for the video. You can also use simple diode like 4148(cathode facing 5v side ) with a pull-up resistor on 3v3 side as a cheap and simple one-directional level convertor.

[@X19-x5f]

Jeremy Fielding on the Dronebot Workshop? Looks like Christmas has come early this year!

[@tubeDude48]

Bravo Bill !! Great and helpful video. I subscribed to Jeremy's site immediately! Thanks.

[@deankay4434]

I am 66 and as a retired ASE automotive Master Tech, I enjoy the learning. I am subscribed to your channel and Jeremy’s both, but for notifications using the “Black Bell” or “Clear Bell”, I never see the results. While others I rarely watch, pop up frequently! I am scratching head. KZbin keeps changing things, like today when “X” to close a video on a iPhone, it drops to the lower right in box style, instead of flat rectangle at the bottom. Strange… Thanks kindly for sharing!

[@wretchedfibs4306]

good ideas. car window motors are cheap and wanted to build a steering mechanism such as a joystick for an outboard engine on a boat. The common steering wheels and cables used are expensive and clunky.

[@yoashuain1]

Yes, Jeremy is awsome.😁😎

[@Rudie_]

I would say that the PWM controls the servo arm position and not the motor shaft position. (3min 58s)

[@DesertVox]

What about using the circuitry inside a hobby servo and soldering it to a bigger motor to drive it?

[@electronic7979]

Helpful video. I liked it

[@Mecatronicgarage]

Hi, very good video. How can I modify the code to instead of an output for a pwm motor controller , use only one L293D with two wires one for each direction of the dc motor.

[@NZHippie]

Great video Bill, at the beginning of the video you outlined the requirements of 720 degrees of rotation yet while explaining the endpoints sketch the rotation was only 120 degrees, I assume that you doing so was that it would be the common servo movement range and not the specific project requirements...

[@isidorovazquez6968]

Awesome video, learned a lot with it. God bless you!

[@damsaddles9911]

Excellent explanation. Thank you

[@youtubeworldlk7650]

very useful drive shaft

[@user-mj3qg6cc2z]

Thank you for your videos. But can explain PID with quadcopter

[@snfn7847]

You trying to do PID tuning?

[@scualo00]

Nice video and grate explanation, thanks!

[@kryptocat4240]

4:57 Sir Can i Use ROTARY ENCODER In Place Of Sensor/Potentiometer

[@Dronebotworkshop]

Read the article, it explains how to use different sensors

[@BeefIngot]

A rotary encoder wont have absolute positioning, so youd need to find a contrived way of homing the servo every time and acknowledge the possibility that a missed step means misalignment.

[@kevgermany]

Love Jeremy's channel. Just wondering why you didn't use a stepping motor.

[@pascallavanchy1642]

Hello DroneBot team, thanks for this wonderfull tuto. I did it with my son for one of his project......works great. I have a quick question that i'm trying to solve. I use a small 12v actuator and drive it with the arduino. when approching the target, the motor slows down in order no to overshoot but up to a point that the motor is forcing whithout moving creating a buzzing noise. I try to fine tune my PID with no succes so far. if you have any idea how to solve this probleme like creating a deadzone i would appreciate. Thanks one again for sharing your work. best Pascal.

[@jacknewzeland4913]

This is an awsome video!!👍

[@easy_3d]

one question. i have a project where i can take inputs from a display and rotate the motor to a specified position. how can i do that only using dc motor and potentiometer ?

[@jrkorman]

Bill, I signed up for the newsletter about 2 years ago, received several through early 2020 and nothing since. I've resubscribed, but a question. Are the newsletters archived so one may read old letters? Thanks. As an aside, glad to see you working with Jeremy, he's quite a talented fellow!

[@douras96]

Thanks for the video. But why use PWM as a command ? It's complicated to "decode" and doesn't mean a rotation. Wouldn't it be simpler and clearer to use something like i2c, spi or even serial communication to send the rotation command ?

[@crazytaxi3277]

Hi, can we build a servo with a latch such that no power is needed when holding at a position for long time?

[@petermolnar6017]

As always superb! Thank you!

[@botak333]

Hi sir how to make steeper closeloop with magnetic sensor as5600

[@mrobi5797]

Awesome video. On a different note, have you ever made a video on the Canaduino Full-Automatic Bootloader Programmer for Atmega328P?

[@Ed_Aylward]

What setting do I change in the code if i want to replace the potentiometer as my input to an AS5600 encoder as my input?

[@miyesisandella1479]

very useful gear set

[@edwardcdg]

Be aware: Potentiometers with wipers will lose linearity with use over time, which means all potentiometers more or less. The wiper will wear the wiped resistance surface thinner in places. Expect to recalibrate from time to time or use a shaft encoder to give a digital output. I have seen a piece of lab equipment unexpectedly drift way off calibration this way.

[@ianbuttery8693]

and they show hysteresis.

[@michaeljoshuamanallo1742]

I been waiting for this

[@SuperToughnut]

I haven't been getting notifications off these videos lately.

[@JohnWinquist]

I've never considered PID use in a servo. Great video as usual. With P set to one and I and D set to zero is not doing anything that remapping the input wouldn't though, right?

[@crazytronics9917]

Thanks a lot i am also working on it and i face some troubleshooting , this video will help me lot. Also i request you to please make video on FOC(Field operation control)

[@ALXandroATS]

Can gear positioning accuracy be improved by using gears with smaller teeth? Hope you can explain the pros and cons when it comes the size/number of gear teeth.

[@alexgonzalez2338]

Bill: Jeremy likes to build big machines. Jason: hold my beer…. Great video, best PID explanation. Looking forward to the series !

[@k4x4map46]

great stuff! what brand and model power supply you using? Looks like a KORAD possibly KA3005D? squinting a bit lol

[@7LegSpiders]

I have 4 of these motors and I wonder if they would work to move a heavy 2-axis CNC. BALDOR 590CD2 TYPE PM3336P ½ HP FR 48Z 1140 RPM 230 V DC MOTOR

[@restaliayurike6838]

hello sir, I want to ask when I make a program using the ultrasonic sensor in the Labview application on the arduino the Tr and Tx lights keep flashing after I run the program and the sensor can't detect it, why sir?

[@Dasol0246]

Can you make a video on Pi Pico PID motor controller for position using micropython, I don’t see any out there on KZbin.

[@AGR472]

That’s really cool

[@andrewbarnard3229]

have you played with the serial wombat io expansion chips? would love to see them used in a project. i have ordered a couple sets now and find them awesome to use especially with small microcontrollers where space is a factor.

[@mohitnama2158]

Sir I have problem in interfacing barcode scanner with raspberry pi pico.. please suggest me

[@jon2487]

Do you have any suggestions for how to add acceleration or deceleration with pid as you mentioned in the video? I don't seem to be able to find any tutorials about that!

[@AdaptivePhenix]

Search for Baldor Motion Products AN00115-001 Trapezoidal Move Calculations There are many texts on this subject but the above document really simplifies the problem.

[@studentofedison421]

Thanks for this video

[@carolinecaroline2264]

Hi there, is it possible that you can do a video on how to create my own nodes in ZOD?

[@kritancreations6471]

How can i make servo with brush dc motor, L292D, arduino nano and potentiometer?

[@pranavdhandar]

Sir please make video on Dot matrix display... Please.. I have to make Project on it in my college...

[@willwyatt9801]

Could this work with an arduino UNO?

[@ericfreund5944]

Any chance of getting access to the code Please? The link is down. :(

[@pranavdhandar]

@DroneBot Workshop Sir please make video on Dot matrix display... Please.. I have to make Project on it in my college...

[@juanfra1997]

I love the video but heres is a challenge to you, do the same with out a microcontroller why? In college mi teacher ask me to do this for finals in theory of control i was not able to do it

[@sefamil9372]

Very good

[@Enigma758]

Why not use an encoder rather than a pot, wouldn't that be less prone to wear, and arguably more accurate?

[@commenter4799]

I searched for this comment. I guess it wouldn't be a big deal for a golf cart, but I was thinking the constant current draw for the pot would be a waste.

[@Enigma758]

@@commenter4799 Absolute encoders are often used in servo motors. What I like about them is that optical encoders are less affected by wear than a pot which has a mechanical wiper.

[@commenter4799]

@Enigma758 not going to lie, I forgot about optical encoders, lol. I was thinking of the hobby encoders that look like pots, which probably wouldn't be any better than the pot.

[@anonymoushandle69]

Was the overflow of micros() inside the interrupt handler considered at all? After 70 minutes wouldn't PWM readings become erroneous?

[@slimhazard]

The start and pwm_period variables are both unsigned. If an unsigned value rolls over by less than half of its range, then subtraction yields the result you‘d expect. For example, if the current value is 1 and the previous one was 2^32 - 1, then 1 - (2^32 - 1) evaluates to 2, and in fact that was a 2 µs interval. So rollover is only a problem in the unlikely event that the PWM pulse lasts longer than 35 minutes.

[@anonymoushandle69]

@@slimhazard thanks for the clarification!

[@GordieGii]

What software do you use to make your diagrams? (e.g. PID loop diagrams)

[@RixtronixLAB]

Nice video, keep it up, thank you :)